吉林大学学报（理学版）2017，Vol.55Issue(2)：444-450,7.DOI:10.13413/j.cnki.jdxblxb.2017.02.43
CdTe量子点荧光猝灭法检测苋菜红浓度
Fluorescence Quenching Method of CdTe Quantum Dots to Detect Concentration of Amaranth
摘要
Abstract
Based on the fluorescence quenching effect of CdTe quantum dots by amaranth,we used fluorescence quenching method of CdTe quantum dots to detect the concentration of amaranth,and analyzed its reaction mechanism. The results show that the linear range of detection is from 4.14×10-6 mol/L to 9.10×10-5 mol/L,and the minimum detection limit is 4.81×10-9 mol/L.The fluorescence quenching constant is 1.91×1012 L/(mol·s),the slope of Stern-Volmer curve at high temperature is lower than that of low temperature,and UV-Vis absorption spectra show that the process is a static quenching process.According to thermodynamics calculation,the thermodynamic parametersΔH?=1.063 kJ/mol,ΔS?=91.36 J/(mol·K)andΔG?=-26.62 kJ/mol,i.e.,and the process is an endothermic and spontaneous process.关键词
CdTe量子点/荧光猝灭/食品添加剂/苋菜红Key words
CdTe quantum dot/fluorescence quenching/food additive/amaranth分类
化学化工引用本文复制引用
张建坡,那丽华,金丽..CdTe量子点荧光猝灭法检测苋菜红浓度[J].吉林大学学报（理学版）,2017,55(2):444-450,7.基金项目
国家自然科学基金(批准号:21405058 （）
21403087). （）
